|Canto 5: The Creative Impetus||Chapter 1: The Activities of Mahārāja Priyavrata|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 5.1.31
ye vā u ha tad-ratha-caraṇa-nemi-kṛta-parikhātās te sapta sindhava āsan yata eva kṛtāḥ sapta bhuvo dvīpāḥ
ye — that; vā u ha — certainly; tat-ratha — of his chariot; caraṇa — of the wheels; nemi — by the rims; kṛta — made; parikhātāḥ — trenches; te — those; sapta — seven; sindhavaḥ — oceans; āsan — became; yataḥ — because of which; eva — certainly; kṛtāḥ — were made; sapta — seven; bhuvaḥ — of the Bhū-maṇḍala; dvīpāḥ — islands.
When Priyavrata drove his chariot behind the sun, the rims of his chariot wheels created impressions that later became seven oceans, dividing the planetary system known as Bhū-maṇḍala into seven islands.
Sometimes the planets in outer space are called islands. We have experience of various types of islands in the ocean, and similarly the various planets, divided into fourteen lokas, are islands in the ocean of space. As Priyavrata drove his chariot behind the sun, he created seven different types of oceans and planetary systems, which altogether are known as Bhū-maṇḍala, or Bhūloka. In the Gāyatrī mantra, we chant, oḿ bhūr bhuvaḥ svaḥ tat savitur vareṇyam. Above the Bhūloka planetary system is Bhuvarloka, and above that is Svargaloka, the heavenly planetary system. All these planetary systems are controlled by Savitā, the sun-god. By chanting the Gāyatrī mantra just after rising early in the morning, one worships the sun-god.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness